Outline 17: Reptiles and Dinosaurs
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1 Outline 17: Reptiles and Dinosaurs Evolution of Reptiles The first reptiles appeared in the Mississippian. They evolved from amphibians, which first appeared in the Devonian. The evolutionary jump was the invention of the amniote egg. The Amniote Egg Requires internal fertilization, unlike amphibians. Has a hard, but porous shell. Can be laid on dry land. Skips the tadpole stage of amphibians. Has a complex series of membranes and a very large yolk.
2 Amphibian Egg: No Shell Frog eggs in a Morgantown pond Typical amniote egg with an embryonic reptile.
3 Crocodiles hatching from their amniote eggs Making Lizard Eggs This is X-rated
4 Making Dinosaur Eggs Fossilized embryos still in the shells
5 Closeup of developing embryo Searching for sauropod dinosaur eggs in Patagonia A single egg laying on an outcrop
6 Dinosaur developing in the egg Researcher working on a nest of sauropod dinosaur eggs Mother and hatchlings in Patagonia sometime in the Cretaceous
7 The fate of many hatchlings Dinosaur parent died while sitting on nest with eggs Recovering the fossil seen in last slide
8 Dinosaur eggs and reconstructed embryo Major Reptile Groups Anapsids - the stem reptiles, turtles are the only living group. Synapsids - the mammal-like reptiles. Mammals evolved from synapsids. Diapsids - all modern reptiles except for turtles. Dinosaurs evolved from diapsids.
9 Pennsylvanian anapsid or stem reptile Living anapsid reptile: snapping turtle Living diapsid reptile: iguana
10 Living diapsid reptile: crocodile Permian synapsid reptiles: Dimetrodon
11 Triassic synapsid reptiles: Therapsids or mammal-like reptiles The Mesozoic: The Age of Reptiles A Nile crocodile. Notice the unspecialized reptilian teeth.
12 Fossil Crocodile from the Jurassic Marine crocodiles of the Mesozoic 28 ft. alligator caught in Alabama lake
13 Sarcosuchus imperator from the Cretaceous of Niger, 45 feet long Jaw of Sarcosuchus in Cretaceous sandstone of Niger, Sahara Desert Sereno s team indicating the size of Sarcosuchus
14 Paul Sereno and the reconstructed jaw of Sarcosuchus Skull of a living 6 ft. long crocodile compared to Sarcosuchus A short-necked Plesiosaur
15 A Jurassic plesiosaur A short-necked Plesiosaur A Mosasaur eating a Cretaceous bird
16 One species of mosasaur attacking another species Ichthyosaurs looked like mammalian dolphins An Ichthyosaur died giving birth
17 A baby ichthyosaur hiding in a reef The Flying Reptiles - Pterosaurs: did they have a high metabolism? Pteranodon
18 Cretaceous pterosaur with 45 ft wing span Carnegie Museum, 2009
19 Evolution of Dinosaurs First appeared in late Triassic, 220 MY ago. Evolved from thecodont archosaurs (crocodiles are closest living relatives). Thecodont ancestor was bipedal and carnivorous. First dinosaurs were bipedal and carnivorous. A Triassic thecodont avoiding a synapsid reptile
20 Archosaurs Archosaurs Evolution of Dinosaurs Later dinosaurs that walked on 4 legs were secondarily quadrapedal. Herbivorous dinosaurs evolved from carnivorous dinosaurs.
21 2 Major Groups of Dinosaurs Saurischians - theropods and sauropods Ornithischians - a variety of herbivores Ornithopods Pachycephalosaurs Stegosaurs Ankylosaurs Ceratopsians Dinosaurs are popular with the public Jack Horner, Montana State Univ.
22 Field Work in Montana Velociraptor was a very active predator
23 Utahraptor waiting to ambush Velociraptors hunted in packs The prey s view of a pack of Allosaurus
24 Dinosaur classification Saurischians Ornithischians Dinosaur hips differ between the two major groups
25 Saurischian hip structure (theropod) Saurischian hip structure (sauropod)
26 Ornithiscian hip structure (stegosaur) Excavating bones at Dinosaur National Monument in Utah A dinosaur mummy from Mongolia
27 Dinosaur skin impression from North Dakota Coelophysis, a late Triassic theropod Dinosaur Paleobiology Herbivorous dinosaurs - sauropods, the largest animals ever on land, had very small heads. How were they able to eat enough? Gizzards In contrast, ornithischians had massive grinding teeth.
28 Apatosaurus or Brontosaurus, the classic sauropod Sauropods, Carnegie Museum, 2008 Sauropods, Carnegie Museum, 2008
29 Sauropods, Carnegie Museum, 2008 Sauropods, Carnegie Museum, 2008 Sauropods, Carnegie Museum, 2008 Looks like your diet is working!
30 Apatosaurus out for a stroll A modern view of sauropods Sauropod trackways showing no evidence of tail dragging.
31 Diplodocus - a gracile sauropod Sauropods eating a coniferous forest The massive digestive system of a sauropod, note the large gizzard
32 Inside of sauropod gizzard, note the gastroliths for grinding food Sauropod gastroliths Plant Debris
33 Iguanodon, an ornithopod A Cretaceous ornithopod Crested hadrosaur or duck-billed ornithopod
34 Duck-billed hadrosaur Hadrosaur styles What were they for? Hadrosaur (ornithopod) grinding teeth
35 Skull of a pachycephalosaur Head butting by pachycephalosaurs Stegosaurus
36 Stegosaurus at the Carnegie Stegosaurus Ankylosaurus
37 Protoceratops from Mongolia Triceratops at the Smithsonian Institution Triceratops from western USA
38 Dinosaur Paleobiology Posture - all dinosaurs had erect limbs, like mammals and unlike living reptiles. Complex behaviors - moved in herds, hunted in packs, had breeding grounds like birds. Sauropod trackways show evidence of herd behavior. Theropod tracks in Utah
39 Warm-Blooded Dinosaurs? Evidence Erect posture, particularly bipedal Bone histology - extensive vascular canals for production of red blood cells Structure of the heart - probably had 4 chambers like birds and mammals, rather than 3 chambers like reptiles. Birds evolved from theropods Evidence of feathers in some dinosaurs Abundant vascular canals in dinosaur bone support the warm-blooded theory Thin section of dinosaur bone
40 A four-chambered heart. A three-chambered heart has only one ventricle (pump). Fossilized heart in an ornithopod. CAT scan shows it has 4 chambers. The ornithopod Thescelosaurus
41 LV RV Theropods and Birds
42 Tyrannosaurus rex, the Cretaceous theropod everyone loves to hate Modern view of a T.rex Sue Henderson, founder of the T. rex named Sue
43 Sue Henderson, founder of the T. rex named Sue It s my bone, I found it. Tyrannosaurus Sue on display in the Chicago Field Museum What makes it a girl? Tyrranosaurs, Carnegie Museum, 2009
44 Mechanical model of T. rex shatters a large bone Compsognathus, a chicken-sized theropod Archaeopteryx, the first bird. Its skeleton is nearly identical to Compsognathus
45 Head of Archaeopteryx -- note the teeth Yours truly with Archaeopteryx in Berlin, June 1998
46 Archaeopteryx carcass in a salty lagoon, 160 MY ago Reconstruction of Archaeopteryx
47 Feathered dinosaur from China, 2002 Dave, a feathered dinosaur preserved in volcanic ash from China
48 Birds evolved from feathered theropods Sinosauropteryx with colored fuzzy feathers based on preserved melanosomes om/news/2010/01/ dinosaur-feathers-colors-nature/ Feathered dinosaur from China, 1998
49 Reconstruction of feathered dinosaur Fossilized gastroliths in feathered dinosaur
50 How similar are birds of prey to their theropod ancestors? Chinese dromaeosaur, 1999
51 Chinese dromaeosaur skeleton with preserved feathers Closeup of feathers on Chinese dromaeosaur Complete skeleton of Chinese dromaeosaur with feathers, tail at the bottom.
52 Tail of Chinese dromaeosaur showing bundles of bony ligaments for stiffening the tail, typical of theropods. Actual fossil birds that are different from feathered dinos Jurassic Blood-Sucking Fleas Discovered in China A team of researchers has unearthed the fossilized remains of blood-sucking mini-beasts dating back at least 65 million years. They found them to be especially suited for sinking their teeth into dinosaurs. Nearly an inch long, the pesky, prehistoric critters were more than ten times the size of today s average household flea.
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